title: Ultrasound hyperthermia applicators: intensity distributions and quality assurance.
abstract: Intensity plots at several depths in water were obtained with three ultrasound hyperthermia applicators (Clinitherm, Mark VII), each with a single plane circular ceramic transducer element. One of the applicators exhibited an anomalous localized intensity maximum 3 cm away from the central beam axis. This observation, and the fact that transducer efficiency and field patterns may change with time and use, suggest quality assurance enhancement through periodic checks of output distributions of ultrasonic applicators for clinical use.
authors.affiliation: University of Maryland School of Medicine, Department of Radiation Oncology, Baltimore 21201.
authors.forename: G H
authors.initials: GH
authors.lastname: Harrison
mesh_terms: D005069:Evaluation Studies as Topic; D006358:Hot Temperature / Q000627:therapeutic use*; D006801:Humans; D011786:Quality Control; D014464:Ultrasonic Therapy / Q000295:instrumentation* / Q000592:standards